Circuits & Schematics: Design - 3

21. Electromechanical damping stabilizes analog-meter readings
    Alexander Bell
    Circuits Analogue Design Measurement
    .. and results in better immunity to external mechanical vibration and shocks that can occur during transportation. This Design Idea applies essentially the same principle to analog meters under normal operating conditions. Connecting a ...
    Sep 30, 2024

22. DIY RTD for a DMM
    Nick Cornford
    Circuits Measurement Texas Instruments LM385-1.2
    .. tell us that frustration increases drive. I was driven to produce the circuit in this design idea by my increasing frustration with a collection of digital thermometers, all of which claimed accuracy to ...
    Sep 25, 2024

23. Dual-coil relay driver uses only two MOSFETs
    Mehmet Efe Ozbek
    Circuits Supply Keysight Technologies N1810UL
    .. circuits for dual-coil relays. Drivers usually include logic elements to make sure to energize only one coil at a time. The design in Figure 1 uses only two MOSFETs to drive a dual-coil RF relay. The N1810UL RF switch has dual 24 V coils ...
    Sep 24, 2024
24. Brute force mitigation of PWM VDD and ground "saturation" errors
    Stephen Woodward
    Circuits Measurement Microcontrollers Usage Texas Instruments TLV9162 SN74AC04
    .. levels in response to the corresponding digital states. Sometimes however, as Christopher Paul observes in the cited design idea (Part 1 of a 4-part series), they don’t. The mechanism behind these deviations isn’t ...
    Sep 23, 2024
25. Switch mode hotwire thermostat
    Stephen Woodward
    Circuits Automation Analogue Design Measurement Supply STMicroelectronics TSB712
    .. recent EDN design ideas, we’ve seen thermostat designs that meld the functions of sensor and heater into a single device: ...
    Sep 18, 2024
26. Digital pot can control gain over a 90 dB span like an electromechanical
    Stephen Woodward
    Circuits Amplifiers Analog Devices OP37
    .. short while back, I published a design idea ( Ref. 1 ) that uses a single linear pot to control the gain of a high performance OP37 decompensated ...
    Sep 3, 2024
27. One-wire bus powers water-level sensor
    Dale Litwhiler
    Circuits Measurement Maxim DS2423
    .. of these capacitors is 0.2 in. These dimensions provide a measurement range of 4 in. with a resolution of 0.2 in. This design uses 1 MΩ for the oscillator timing resistor, RC, because the timing resistance must be much larger ...
    Sep 2, 2024
28. An accurate resettable fuse
    Peter Demchenko
    Circuits Supply ON Semiconductor TIP32G
    .. fuse described in this design idea does not drop the connection, it simply limits the output current. A behavior that is similar to a ...
    Aug 14, 2024
29. Simple discrete SE-to-differential precision in-amp circuit: High common-mode input range and 50% less power
    Chau Tran Jordyn Rombola
    Circuits Analogue Design Measurement Analog Devices AD629 AD7685 AD8421 ADA4807-2
    .. is cost and performance competitive with monolithic instrument amplifiers. Figure 1 details the proposed precision system design to allow the user to measure differential signals in the presence of a high common-mode voltage. The circuit ...
    Aug 8, 2024
30. Synthesize precision Dpot resistances that aren't in the catalog
    Stephen Woodward
    Circuits Analogue Design Microchip MCP4141
    .. thus forming a precise programmable resistance. This relationship makes current I AB linearly proportional to N. Design equations are for appropriate resistances starting from specified R AB , R MAX , and R MIN are: Figure 3 ...
    Aug 7, 2024

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